.net平台下面的RSA算法实现是RSACryptoServiceProvider，如果安装了 Microsoft
Enhanced Cryptographic Provider，则 RSACryptoServiceProvider 支持长度从 384 位至
16384 位（增量为 8 位）的密钥。如果安装了 Microsoft Base Cryptographic Provider，则支持长度从 384
位至 512 位（增量为 8 位）的密钥。
目前该算法支持的填充Padding算法为PKCS#1
1.5和OAEPPadding，而签名算法目前仅支持SHA1withRSA算法，其他的好像没有提供，或许需要安装其他provider,目前第三方的provider可以使用Bouncy
Castle的C#实现http://www.bouncycastle.org/csharp/，使用Bouncy
Castle的包可以实现
RIPEMD128、RIPEMD160、RIPEMD256、SHA-1、SHA-224、SHA-256、SHA-384、SHA-512、MD2，MD4，MD5等HASH算法与RSA的集成签名算法。
为了更好的处理BigInteger运算的问题，在本文中用到了http://www.codeproject.com/csharp/biginteger.asp提供的BigInteger.cs用来处理大数运算的问题，用来验证的DLL实用delphi实现的，当然也可以用java来验证，效果相同，该DLL的代码在下面专题中作详细讲解。
具体源代码如下：
using System.Text.RegularExpressions;using System.Text;using System.IO;using System.Net;using System.Xml;using System.Runtime.InteropServices;using System;using System.Security;using System.Security.Cryptography;
/*
RSA Keyinfo: --------------------------------------------------------------------- 可以采用java或者.net生成下面参数信息 加密位：1024bits >>>PrivateKey: modulus:123410773237385713572440712840019405878257600213906351775134402766524785605776353635515879438375969303333340691224323217379791619946464100287854264933660919378485000299257054039555887477610831829409144592603086784397675690934246422666689022312589317493002336070775714030955737435316659994026756956753416169929 public exponent:65537 private exponent:102299672961750099570264341757280532275542401837445663770632643616494888426681205847125069294737520917541038900032845310395266178574112466427178094767628391398378924953787043659322148498169017989730953803803890989295625028193153480552247210183981959942844345362118479513739632952091865360095551345350474614233 prime p:12794390226544301614076650435602993036558056678553112540698297249963365434628505393116653422818365344228379828231764392521731584684435248093787027949139091 prime q:9645694015283940797244851561543569992525098416055322825220116046655435860727361740896753161534492415500799272063647633894112205918420307541634544631799219 prime exponent p:1529969882744521289493243655703200580244831014386083326692594344385048063096931454992679141166478923397741927672190328275520857365639547725880173612423563 prime exponent q:769453717928871362558494956494038236735297839680443531596667023084892788499361386413907037681040120057954721673997128797449053397950796768659923391901465 crt coefficient:12583540851660819630796910273258143748946857763306703439274571717196507402536398234616014735603915981141807543055250658251670340810611251684169356826070785 >>>PublicKey: modulus:123410773237385713572440712840019405878257600213906351775134402766524785605776353635515879438375969303333340691224323217379791619946464100287854264933660919378485000299257054039555887477610831829409144592603086784397675690934246422666689022312589317493002336070775714030955737435316659994026756956753416169929 public exponent:65537
*/public class RSATest{ [DllImport("cmipcrypt.dll")] public static extern String Cmip_Encrypt(String text,String exp,String module); [DllImport("cmipcrypt.dll")] public static extern String Cmip_Decrypt(String etext,String d,String module); [DllImport("cmipcrypt.dll")] public static extern String Cmip_SignData(String text,String d,String module,String alg); [DllImport("cmipcrypt.dll")] public static extern String Cmip_VerifyData(String text,String signtext,String r,String module); [DllImport("cmipcrypt.dll")] public static extern String Cmip_ComputeHash(String text,String alg); private String p,q,e,n,d,dp,dq,crt; private RSAParameters param;
public void init(){ p="12794390226544301614076650435602993036558056678553112540698297249963365434628505393116653422818365344228379828231764392521731584684435248093787027949139091"; q="9645694015283940797244851561543569992525098416055322825220116046655435860727361740896753161534492415500799272063647633894112205918420307541634544631799219"; e="65537"; n="123410773237385713572440712840019405878257600213906351775134402766524785605776353635515879438375969303333340691224323217379791619946464100287854264933660919378485000299257054039555887477610831829409144592603086784397675690934246422666689022312589317493002336070775714030955737435316659994026756956753416169929"; d="102299672961750099570264341757280532275542401837445663770632643616494888426681205847125069294737520917541038900032845310395266178574112466427178094767628391398378924953787043659322148498169017989730953803803890989295625028193153480552247210183981959942844345362118479513739632952091865360095551345350474614233"; dp="1529969882744521289493243655703200580244831014386083326692594344385048063096931454992679141166478923397741927672190328275520857365639547725880173612423563"; dq="769453717928871362558494956494038236735297839680443531596667023084892788499361386413907037681040120057954721673997128797449053397950796768659923391901465"; crt="12583540851660819630796910273258143748946857763306703439274571717196507402536398234616014735603915981141807543055250658251670340810611251684169356826070785"; param=new RSAParameters(); byte[] bdata=GetBytes(e); param.Exponent=bdata; param.P=GetBytes(p); param.Q=GetBytes(q); param.Modulus=GetBytes(n); param.D=GetBytes(d); param.DP=GetBytes(dp); param.DQ=GetBytes(dq); param.InverseQ=GetBytes(crt);
} public static void Main(String[] args) { if(args.Length<2){ Console.WriteLine("\nRSATest.exe [text明文] [hash算法]。"); return; } RSATest rsa=new RSATest(); rsa.init(); rsa.DelphiDllTest(args[0],args[1]); rsa.DotnetRSATest(args[0],args[1]); rsa.InteropTest(args[0],args[1]); } public void DelphiDllTest(String text,String alg){ String res=Cmip_Encrypt(text,e,n); Console.WriteLine("=====================Dll调用RSA测试====================="); Console.WriteLine("\n1.明文："+text); //加密 Console.WriteLine("\n2.RSA加密："+res); res=Cmip_Decrypt(res,d,n); Console.WriteLine("\n3.RSA解密："+res); //签名 String signdata=Cmip_SignData(text,d,n,alg); Console.WriteLine("\n4.对明文采用"+alg.Trim()+"withRSA的签名算法，签名数据为：\n"+signdata); Console.WriteLine("\n5.RSA验证签名:"+Cmip_VerifyData(text,signdata,e,n)); Console.WriteLine("\n6.采用HASH算法"+alg+"计算明文的结果:"+Cmip_ComputeHash(text,alg)); } //.net只实现了SHA1的rsa签名算法 public void DotnetRSATest(String text,String alg){ Console.WriteLine("\n\n\n=========.net RSACryptoServiceProvider调用RSA测试========="); RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); rsa.ImportParameters(param); RSAParameters param1=rsa.ExportParameters(true); Console.WriteLine("1.明文:"+text); byte[] data=Encoding.Default.GetBytes(text); byte[] endata=rsa.Encrypt(data,false); Console.WriteLine("\n2.publicKey加密后的数据:"+Convert.ToBase64String(endata)); byte[] dedata=rsa.Decrypt(endata,false); Console.WriteLine("\n3.privateKey解密后的数据:"+Encoding.Default.GetString(dedata)); //签名 HashAlgorithm hashalg=null; switch(alg.ToUpper()){ case "MD5": hashalg=new MD5CryptoServiceProvider(); break; case "SHA1": hashalg=new SHA1CryptoServiceProvider (); ; break; case "SHA256": hashalg=new SHA256Managed(); break; case "SHA384": hashalg=new SHA384Managed(); break; case "SHA512": hashalg=new SHA512Managed(); break; default: throw new Exception("不支持的HASH算法："+alg); } try{ byte[] signdata=rsa.SignData(data,hashalg); Console.WriteLine("\n4.对明文采用"+alg.Trim()+"withRSA的签名算法，签名数据为：\n"+Convert.ToBase64String(signdata)); Console.WriteLine("\n5.RSA验证签名:"+rsa.VerifyData(data,hashalg,signdata)); }catch(CryptographicException ex){ Console.WriteLine("\n==================================="); Console.WriteLine("!!!指定的HASH算法在.net中可能未实现！："+ex.Message+"\n.net可用算法"+rsa.SignatureAlgorithm); Console.WriteLine("==================================="); } byte[] hash=hashalg.ComputeHash(data); Console.WriteLine("\n6.采用HASH算法"+alg+"计算明文的结果:"+ConvByteArrayToHex(hash)); String res=Cmip_Decrypt(Convert.ToBase64String(endata),d,n); Console.WriteLine("\n"+res); Console.WriteLine(Encoding.Default.ToString()); } //dll加密，.net解密 //dll签名，.net验证 public void InteropTest(String text,String alg){ String res=Cmip_Encrypt(text,e,n); Console.WriteLine("\n=====================跨语言平台调用RSA测试====================="); Console.WriteLine("\n1.明文："+text); //加密 Console.WriteLine("\n2.DLL RSA加密："+res); RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); rsa.ImportParameters(param); byte[] txdata=rsa.Decrypt(Convert.FromBase64String(res),false); Console.WriteLine("\n3.RSACryptoServiceProvider RSA解密："+Encoding.Default.GetString(txdata)); //dll签名，.net验证 String signdata=Cmip_SignData(text,d,n,alg); Console.WriteLine("\n4.DLL 对明文采用"+alg.Trim()+"withRSA的签名算法，签名数据为：\n"+signdata); //签名 HashAlgorithm hashalg=null; switch(alg.ToUpper()){ case "MD5": hashalg=new MD5CryptoServiceProvider(); break; case "SHA1": hashalg=new SHA1CryptoServiceProvider (); ; break; case "SHA256": hashalg=new SHA256Managed(); break; case "SHA384": hashalg=new SHA384Managed(); break; case "SHA512": hashalg=new SHA512Managed(); break; default: throw new Exception("不支持的HASH算法："+alg); } try{ Console.WriteLine("\n5.RSACryptoServiceProvider RSA验证签名:"+rsa.VerifyData(Encoding.Default.GetBytes(text),hashalg,Convert.FromBase64String(signdata))); }catch(CryptographicException ex){ Console.WriteLine("\n==================================="); Console.WriteLine("!!!指定的HASH算法在.net中可能未实现！："+ex.Message+"\n.net可用算法"+rsa.SignatureAlgorithm); Console.WriteLine("==================================="); } } public static byte[] GetBytes(String num){ BigInteger n=new BigInteger(num,10); String s=n.ToString(2); if(s.Length%8>0){ s=new String(‘0‘,8-s.Length%8)+s; } byte[] data=new byte[s.Length/8]; String ocetstr; for(int i=0;i<data.Length;i++){ ocetstr=s.Substring(8*i,8); data[i]=Convert.ToByte(ocetstr , 2 ) ; } return data; } public String ConvByteArrayToHex(byte[] data){ String s=""; for(int i=0;i<data.Length;i++){ s+=Convert.ToString(data[i],16); } return s.ToUpper(); }}
运行结果如下：
|
d:\>rsatest hello加密
sha1 1.明文：hello加密 2.RSA加密：A/0ZWckK9C6JyTk8NmwESVSI/N8OyQ7nYBEK8cpzo30nHj+Pb0WfvQ+lFa38Xk3cd+d8ueysTSc7tqr4Wjk831d0MexAC2yJ4SkqLWfKnhuU0OxF6d4s8UpegvuMBy1KWpzovbFGa3HUGRmMVbu4GqPDdzkvFmfWzGArXXiDpVw= 3.RSA解密：hello加密 4.对明文采用sha1withRSA的签名算法，签名数据为： 5.RSA验证签名:true 6.采用HASH算法sha1计算明文的结果:C3F118FF24E166AC977EC9C3D69A5AF8B7C78F8B =========.net RSACryptoServiceProvider调用RSA测试========= 1.明文:hello加密 2.publicKey加密后的数据:NrW/Uwjd72SduBgQkOFjjtEibTX/+WOCV0/oIFMiEln5uhLZ5OaH6cyWPEXBEwjZIiUY78dmdk8BW6SmiDArNwFePf/tM7KCAcSU9Zz3PGl07ZDmvT1P8F24caKaX9+fGwy72mOtoBhFnKh18oOjq4wZ06e1g8IQQQco9W+kHgU= 3.privateKey解密后的数据:hello加密 4.对明文采用sha1withRSA的签名算法，签名数据为： 5.RSA验证签名:True 6.采用HASH算法sha1计算明文的结果:C3F118FF24E166AC977EC9C3D69A5AF8B7C78F8B hello加密 System.Text.DBCSCodePageEncoding =====================跨语言平台调用RSA测试===================== 1.明文：hello加密 2.DLL RSA加密：P/AP7Iwv7pYxh+T1a/PZ4UBCZABu7zPpNt65W5ncNfo8eVQbH8jlH/Jv+fGa0x4CCmRUaTA0O1HeO4LowRpFyPJkwLxQAsMedvfRcQ7Ro2Hggoz5uwRG6QZ2go0Io0KAOGhcV4efKHFG2xro4jYX2O2hWyHTeMldDQPxt98z2co= 3.RSACryptoServiceProvider RSA解密：hello加密 4.DLL
对明文采用sha1withRSA的签名算法，签名数据为： 5.RSACryptoServiceProvider RSA验证签名:True |
有关程序下载：
http://files.cnblogs.com/midea0978/rsa.net.rar
附注：对于这个RSA的跨平台技术，已经是07年研究的结果，后来就没怎么深入了，目前本人已经在一个项目中使用这方面该技术，应用在delphi,powerbuilder,J2EE复合环境中。对于这方面的详细源代码或者技术支持感兴趣的话，如能提供一定报酬的基础上，可使用站内消息联系博主转让！
当然如果免费使用的话，附件中的cmipcrypt.dll是没有任何限制，随便使用。
.net平台的RSA实现以及与Delphi之间的互操作性,布布扣,bubuko.com
原文：http://www.cnblogs.com/adylee/p/3611772.html